Floquet Engineering of a Quasiequilibrium Superradiant Phase Transition in Landau Polaritons
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866918437838651392 |
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| author | Wu, Wen-Hua Tay, Fuyang Che, Mengqian Baydin, Andrey Kono, Junichiro Hagenmüller, David |
| author_facet | Wu, Wen-Hua Tay, Fuyang Che, Mengqian Baydin, Andrey Kono, Junichiro Hagenmüller, David |
| contents | Superradiant phase transitions (SRPTs), characterized by photon condensation and macroscopic matter polarization, are forbidden in equilibrium for homogeneous fields by no-go theorems. Here, we show that Floquet driving can circumvent this constraint in a Landau polariton system consisting of a two-dimensional electron gas coupled to a terahertz cavity in a DC magnetic field. An off-resonant AC magnetic field modulates the cyclotron frequency and light--matter coupling strength while leaving the diamagnetic term unchanged, generating an additional DC coupling contribution. This drives the system across a critical threshold into a superradiant phase, characterized by photon condensation and Landau-level polarization in the ground state of the Floquet Hamiltonian. This quasiequilibrium approach offers a route to SRPTs distinct from driven-dissipative schemes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_08635 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Floquet Engineering of a Quasiequilibrium Superradiant Phase Transition in Landau Polaritons Wu, Wen-Hua Tay, Fuyang Che, Mengqian Baydin, Andrey Kono, Junichiro Hagenmüller, David Mesoscale and Nanoscale Physics Quantum Physics Superradiant phase transitions (SRPTs), characterized by photon condensation and macroscopic matter polarization, are forbidden in equilibrium for homogeneous fields by no-go theorems. Here, we show that Floquet driving can circumvent this constraint in a Landau polariton system consisting of a two-dimensional electron gas coupled to a terahertz cavity in a DC magnetic field. An off-resonant AC magnetic field modulates the cyclotron frequency and light--matter coupling strength while leaving the diamagnetic term unchanged, generating an additional DC coupling contribution. This drives the system across a critical threshold into a superradiant phase, characterized by photon condensation and Landau-level polarization in the ground state of the Floquet Hamiltonian. This quasiequilibrium approach offers a route to SRPTs distinct from driven-dissipative schemes. |
| title | Floquet Engineering of a Quasiequilibrium Superradiant Phase Transition in Landau Polaritons |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2604.08635 |